package com.stx.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.apache.struts2.ServletActionContext;

import com.stx.entity.User;
/*
 * 过滤 用户已经登陆后再次访问 登陆页面和注册页面
 * */
public class MyFilter implements Filter {

	@Override
	public void destroy() {
		// TODO Auto-generated method stub
		
	}

	@Override
	public void doFilter(ServletRequest arg0, ServletResponse arg1,
			FilterChain arg2) throws IOException, ServletException {
		
		    HttpSession session=((HttpServletRequest)arg0).getSession();
		    User user=(User) session.getAttribute("user");
		    if(user!=null){
		    	arg0.getRequestDispatcher("changeuser.action").forward(arg0, arg1);
		    }else{
		    	arg2.doFilter(arg0, arg1);
		    }
		
	}

	@Override
	public void init(FilterConfig arg0) throws ServletException {
		// TODO Auto-generated method stub
		
	}

}
